| Starter | Tm | Tier | Game |
|---|---|---|---|
| Wilbur Wood | CHA | 11.92 | 197306150_MIL_CHA |
| Jim Palmer | BAL | 7.73 | 197306160_TEX_BAL |
| Don Sutton | LAN | 4.93 | 197306170_LAN_WAS |
| Bert Blyleven | MIN | 4.66 | 197306160_MIN_DET |
| Gaylord Perry | CLE | 4.16 | 197306171_KCA_CLE |
| Starter | Tm | Tier | Game |
|---|---|---|---|
| Steve Arlin | SDN | -2.85 | 197306150_SDN_NYN |
| Mike Kekich | CLE | -1.73 | 197306172_KCA_CLE |
| Rich Hand | ANA | -1.42 | 197306172_NYA_ANA |
| Steve Busby | KCA | -1.41 | 197306160_KCA_CLE |
| Steve Dunning | TEX | -1.11 | 197306160_TEX_BAL |
Based on accumulated WAA for this season up to 1973-06-17.
| Rank | WAA | Name | IP | Tm |
|---|---|---|---|---|
| +001+ | 5.8 | Ken Holtzman | 138 | OAK |
| +003+ | 4.65 | Rick Reuschel | 106 | CHN |
| +005+ | 4.57 | Wilbur Wood | 170.3 | CHA |
| +006+ | 4.42 | Tom Seaver | 114.3 | NYN |
| +008+ | 4.31 | Bill Lee | 107.3 | BOS |
| +009+ | 4.05 | Ron Bryant | 117.7 | SFN |
| +010+ | 4.03 | Jim Colborn | 107.7 | MIL |
| +012+ | 3.66 | Wayne Twitchell | 84.7 | PHI |
| +014+ | 3.32 | Bert Blyleven | 124.7 | MIN |
| +016+ | 3.23 | Nolan Ryan | 133 | ANA |
| +017+ | 3.1 | Paul Splittorff | 119.3 | KCA |
| +018+ | 3.06 | Jim Palmer | 109.3 | BAL |
| +019+ | 2.94 | Don Sutton | 121.7 | LAN |
| +022+ | 2.75 | Bill Singer | 125 | ANA |
| +024+ | 2.64 | Dave McNally | 114.3 | BAL |
| +026+ | 2.51 | Bill Greif | 99.3 | SDN |
| +028+ | 2.39 | Jim Hunter | 125 | OAK |
| +030+ | 2.38 | Jerry Koosman | 102.7 | NYN |
| +032+ | 2.36 | Dave Roberts | 90.3 | HOU |
| +041+ | 2.15 | Alan Foster | 68.7 | SLN |
| +046+ | 2.08 | Bob Gibson | 114 | SLN |
| +047+ | 2.02 | Rollie Fingers | 43.7 | OAK |
| +049+ | 1.99 | Ross Grimsley | 99.3 | CIN |
| +056+ | 1.84 | Phil Niekro | 77.7 | ATL |
| +061+ | 1.72 | Jim Perry | 92 | DET |
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